public override double Length()
{
return(2 * (FirstSide.Length() + SecondSide.Length()));
}
public override string ShowInfo()
{
return($"Прямоугольник со сторонами {FirstSide.Length():0.000} и {SecondSide.Length():0.000}, площадью {this.Area():0.000} и радиусом {this.Length():0.000}");
}
public double Area()
{
return(FirstSide.Length() * SecondSide.Length());
}